A and B can do a work in 10 days and 40 days, respectively. How long will it take together to complete the work?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 8 days.
A's 1-day work = 1/10
B's 1-day work =1/40
(A + B)'s 1-day work = 1/10 + 1/40
= = 5/40
= 1/8
Hence, time taken by A and B together to complete the work = 8 days